Locomotive-fire-box construction.



LE GRAND PARISH.

LOCOMOTIVE FIRE BOX CONSTRUCTION..

APPLICATION FILED MAYIS. 1914.

l fi fy m Patented Apr. 23, 1918.

Imw/wtor' LE GRAND rrinrsrr, or new roan, 1\T.Y.

. LOCOMOTIVE-FIRE-BOX CONSTRUCTION.

measles.

This invention has reference to locomotive fire-box constructions and relates particularly to an improved arrangementof refractory arch or wall which increases the general efficiency of the firebox, not only by securing a more intimate admixture, and,

therefor-as. more complete ignition and con 1 sumption of the gases of combustion, but also by storing or retaining a large quantity of heat. My invention is addition contemplates the provision of an improvement having the characteristics described in which the parts are so arranged that the bricks constituting the arch are securely supported, and readily inserted or removed for purposes of repair, replacement or inspection. In conjunction with the foregoing, I attain greater circulation, as will further appear.

The foregoing, together with such other objects as may hereinafter appear or are incident to my invention I attain by means of a construction, the preferred embodiment of which I have illustrated in the accompany ing drawings, wherein Figure 1 is a longitudinal section through a locomotive fire-box having my improvement applied thereto; Fig. 2 is a cross section through the arch on the line IIII of Fig. 1, but drawn on a larger scale; Fig, 3 is a similar section through a modified form of the arch construction; and Fig. 4 shows two complete arches.

The fire-box shown is of standard construction and comprises an inner fire-box composed of a tube sheet 1, side sheets 2, a back sheet 3, and a crown sheet 1; and the outer fire-box is composed of a throat sheet 1, outer side sheets 2*, an outer'back sheet 3, and a top or cover sheet or plate P. The back sheets 3 and 8 are connected by stay bolts 6, and the crown sheet and cover sheet are connected by radial stay bolts 7. The water legs or spaces between the walls of the fire-box are closed by the mud ring 5. The usual fine sheet 13 is provided at the forward end of the box, and, the ends of Specification of Letters Patent.

Patented Apr. 23, rails.

Application filed May 15, 1914. Serial No. 838,653.

the fines 12 are expanded therein, as is customary.

In carrying out my invention, I provide refractory arches composed of suitable bricks and preferably located one above the other. For these two arches, I provide supporting members, and in the drawing I have shown these supporting members as circulation tubes, this being the type preferred as greater circulation between the water walls can be obtained.

Referring now to the specific embodiments shown, it will be seen that the circulation tubes are arranged in two rows 8 and 8 the tubes being substantially parallel and preferably arranged one above the other. They extend rearwardly and upwardly from the front water wall to the rear water wall, and arespaced apart a sullicient distance to perunit the free insertion of the bricks constitutingthe arches. The upper arch comprises a central wall composed of rows ofbricks 9, 10, and 11, preferably socketed on the tubes of the row 8 in the manner shown in the drawings, and side walls composed of rows of bricks 14 and 15. The rows of bricks 14 and 15 are preferably socketed on the outermost tubes at their inner ends, and bear against the side sheets 2 at their outer ends, inclining upwardly from the tubes. The lower arch comprises three rows of bricks, 9, 10, and 11, corresponding to the rows 9, 10, and 11. The end rows of bricks 14c and 15, however, may be omitted for the purpose of securing an intimate and more complete admixture of the hot gases of combustion. The gases impinge 011 the lower arch and flow or swirl around it and on the under face of the upper arch to the rear end thereof,from which point they pass forwardly to the fines. These movements result in a tho-rough mixture of the gases, which secures better ignition and more complete combustion. At the same time the two arches, because of theirrelatively large mass, absorb and retain a great quantity of heat which reacts directly on the water in the tubes. The water in the tubes is thus subjected to a higher temperature, and the flow induced through the tubes is greater than in the usual forms of construction. It will be clear from the foregoing that the arrangement obtains greater efliciency, not only because of the fact that better and: more perfect com Lml bustion is secured, but also because of the or rows of bricks 14 and 15 being entirely omitted. It will be seen that this arrangement also secures the combined advantages of greater heat storage and better mixture of the gases, and free access to the stay bolts in the side sheets when required without the necessity of removing any bricks. By the above described arrangement, when the bricks ofthe lower row become thin from use, they can be put on the upper row and new brick applied to the lower row, thus extending the life of the bricks in the arch.

Where two complete arches are used, as

. shown in Fig. 4:, an opening is left in the row being substantially above the tubes of I lower one whereby circulation may take place between the two, thus giving additional ignition surfaces, as well as increased heat storage. I have indicated such an opening at 16in Fig; l. 7

Iclaim -1.' A locomotive fire-box comprising ,in

combination water walls, 'a plurality of rear- .wardly and upwardly extending circulation tubes arranged in two rows, the tubes of one the other row, and two heat storage arch Walls one on each row of tubes, each comprising a plurality of arch bricks accessibly and removably supported on the tubes, and extending rearwardly from a point adjacent the forward end of the box a portion of the distance to the rear end of the box, the lower arch wall being arranged to permit the circulation or passage of the gases of combustion rearwardly between the arch walls and pass over the end of the upper arch wall, substantially as described.

2. A locomotive fire box comprising in combination water walls, fines extending forwardly from the fire box, a plurality of rearwardly and upwardly extending circulation tubes arranged in two rows, said tubes connecting water walls and extending from the forward water wall at a point beneath the flues, and two heat storage arch walls one on each row of tubes, each comprising a plurality of arch bricks accessibly and removably supported on the tubes, one of said arch walls being substantially co-extensive with the fire box in width and lying adjacent the forward water wall to protect the ends of the fines, and the other arch wall being arranged to permit circulation between the walls.

In testimony whereof I have hereunto signed my name in the presence of the two subscribed witnesses.

. LE GRAND PARISH.

Witnesses:

PAUL SYNNEs'rvnD'r, HARVEY L. LECHNER.

Ccpies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

' Washington, D. C. 

